If they are male mounts only, with no adapters for metric, then they could only be used on a highway peg mount, not a riders mount. And if mounted at the rider position, and were extended, you could quickly get in trouble in even a medium lean since they extend much farther out than even wide floorboards.
If you would like a wider footprint at the drivers position, but without floorboards, many have been happy with ISO Wings, which allow good access to the Valk shifter (without a kickshift).
http://www.kuryakyn.com/Products/958/ISO-Wing-Pegs-without-Adapters#7946
http://www.kuryakyn.com/Products/1597/Peg-Adapters-for-Cruisers-Sport-Bikes